HTML - textarea minimo 10 caracteres!

<form action="" method="post">

    <textarea id="mitexto"></textarea>

    <input type="submit" value="enviar">

</form>

<script>

document.querySelector("input[type=submit]").addEventListener("click",function(e){

    var texto=document.getElementById("mitexto")

    if(texto.value.length<10)

    {

        e.preventDefault();

        console.log("Tiene menos de 10 caracteres");

    }

});

</script>